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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.stax.ext;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;

import javax.xml.stream.XMLStreamException;
import java.util.Set;

/**
 * This is the Interface which every InputProcessor must implement.
 *
 * @author $Author: giger $
 * @version $Revision: 1395267 $ $Date: 2012-10-07 11:02:46 +0100 (Sun, 07 Oct 2012) $
 */
public interface InputProcessor {

    /**
     * Add this processor before the given processor
     *
     * @param processor
     */
    void addBeforeProcessor(Object processor);

    /**
     * This InputProcessor will be added before the processors in this set
     *
     * @return The set with the named InputProcessors
     */
    Set getBeforeProcessors();

    /**
     * Add this processor after the given processor
     *
     * @param processor
     */
    void addAfterProcessor(Object processor);

    /**
     * This InputProcessor will be added after the processors in this set
     *
     * @return The set with the named InputProcessors
     */
    Set getAfterProcessors();

    /**
     * The Phase in which this InputProcessor should be applied
     *
     * @return The Phase
     */
    XMLSecurityConstants.Phase getPhase();

    /**
     * Will be called from the framework when the next security-header XMLEvent is requested
     *
     * @param inputProcessorChain
     * @return The next XMLSecEvent
     * @throws XMLStreamException   thrown when a streaming error occurs
     * @throws XMLSecurityException thrown when a Security failure occurs
     */
    XMLSecEvent processNextHeaderEvent(InputProcessorChain inputProcessorChain) throws XMLStreamException, XMLSecurityException;

    /**
     * Will be called from the framework when the next XMLEvent is requested
     *
     * @param inputProcessorChain
     * @return The next XMLSecEvent
     * @throws XMLStreamException   thrown when a streaming error occurs
     * @throws XMLSecurityException thrown when a Security failure occurs
     */
    XMLSecEvent processNextEvent(InputProcessorChain inputProcessorChain) throws XMLStreamException, XMLSecurityException;

    /**
     * Will be called when the whole document is processed.
     *
     * @param inputProcessorChain
     * @throws XMLStreamException   thrown when a streaming error occurs
     * @throws XMLSecurityException thrown when a Security failure occurs
     */
    void doFinal(InputProcessorChain inputProcessorChain) throws XMLStreamException, XMLSecurityException;
}